
package com.sc.jat.ss.security;   

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

import org.springframework.security.access.intercept.AbstractSecurityInterceptor;
import org.springframework.security.access.intercept.InterceptorStatusToken;
import org.springframework.security.web.FilterInvocation;
import org.springframework.security.web.access.intercept.FilterInvocationSecurityMetadataSource;

/**   
 * ClassName:CustomFilter   
 * Function: TODO ADD FUNCTION   
 *   
 * @author   sux   
 * @version  1.0, 2011-8-16   
 * @since    ss31.0   
 */
public class CustomFilter extends AbstractSecurityInterceptor implements Filter{
	
	private FilterInvocationSecurityMetadataSource securityMetadataSource;
	
	@Override
	public Class<? extends Object> getSecureObjectClass() {
		return FilterInvocation.class;   
	}

	@Override
	public SecurityMetadataSource obtainSecurityMetadataSource() {
		return (SecurityMetadataSource) this.securityMetadataSource;   
	}

	public void destroy() {
	}

	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException,
			ServletException {
		  FilterInvocation fi = new FilterInvocation(request, response, chain);
		  InterceptorStatusToken token = super.beforeInvocation(fi);
		  try{
			  fi.getChain().doFilter(fi.getRequest(), fi.getResponse());
		  }finally{
			  super.afterInvocation(token, null);
		  }
	}

	public void init(FilterConfig arg0) throws ServletException {
	}

	public FilterInvocationSecurityMetadataSource getSecurityMetadataSource() {
		return securityMetadataSource;
	}

	public void setSecurityMetadataSource(FilterInvocationSecurityMetadataSource securityMetadataSource) {
		this.securityMetadataSource = securityMetadataSource;
	}
}
   
